On 06/09/2010 03:55 PM, Aurelien Jarno wrote: > On Fri, Jun 04, 2010 at 12:14:13PM -0700, Richard Henderson wrote: >> Before gcc 4.2, __builtin___clear_cache doesn't exist, and >> afterward the gcc s390 backend implements it as nothing. > > Does it means that instruction and data caches are coherent on s390?
Yes. Principles of Operation, 2.1 Main storage: # Main storage may include a faster-access buffer storage, sometimes called a cache. # Each CPU may have an associated cache. The effects, except on performance, of # the physical construction and the use of distinct storage media are not observable # by the program. This architecture pre-dates caches, I think. ;-) r~
